Background: : Gastritis, characterized by inflammation of the stomach lining, poses a significant health challenge among adolescents, often exacerbated by modifiable risk factors including unhealthy dietary patterns, chronic stress, limited health literacy, and insufficient family support. In urban settings like Sukabumi City, Indonesia, adolescents face heightened vulnerability due to lifestyle shifts, academic pressures, and irregular eating habits, leading to prevalent symptoms such as epigastric pain, nausea, and dyspepsia. Despite its commonality, few studies have systematically analyzed the interplay of these factors in this demographic, underscoring the need for targeted correlational research to inform preventive strategies in nursing education and public health. Objectives: This study aimed to analyze the factors influencing gastritis incidence among adolescents in Sukabumi City, with a focus on diet, stress, health knowledge, and family support. Methods: Employing a correlational design with a cross-sectional approach, the research involved 105 adolescents aged 12-18 years, selected via proportionate random sampling from local schools. Data were gathered using a validated questionnaire assessing dietary habits (e.g., meal frequency and food choices), stress levels (via perceived stress scales), knowledge of gastritis prevention, and family support metrics. Statistical analysis included chi-square tests and logistic regression to determine associations (p<0.05 significance). Results: Approximately 65% of respondents exhibited gastritis symptoms, with psychosocial factors—particularly high stress (OR=2.8, p=0.002) and irregular eating (OR=3.1, p<0.001)—emerging as significant predictors. Family support and health knowledge showed no statistically significant impact (p>0.05). Conclusions: Stress and poor dietary habits are primary drivers of gastritis in adolescents. Nursing-led interventions, including school-based education on stress management and nutrition, are crucial for mitigation